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Linux Bible, 8th Edition by Christine Bresnahan, Christopher Negus

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Chapter 22

Understanding Basic Linux Security

In This Chapter
Understanding the Security Process Lifecycle
Planning security
Implementing security
Monitoring security
Auditing and reviewing security

Understanding security is a crucial part of Linux system administration. No longer are a username and simple password sufficient for protecting your server. The number and variety of computer attacks escalate every day, and the need to improve computer security continues to grow with it.

Some of the security problems you may face as an administrator include denial-of-service (DoS) attacks, root kits, worms, viruses, logic bombs, man-in-the-middle ploys, Trojan horses, and so on. The attacks don't come just from the outside of the organization. They can also come from the inside. Protecting your organization's valuable information assets can be overwhelming.

Your first step is to gather knowledge of basic security procedures and principles. With this information, you can begin the process of locking down and securing your Linux servers. Also, you can learn how to stay informed of daily new threats and the new ways to continue protecting your organization's valuable information assets.

Introducing the Security Process Lifecycle

Like software development, securing a computer system has a process life cycle. This Security Process Lifecycle has four main phases, as shown in Figure 22.1. Each phase has important activities that help to create a system hardened against security attacks. ...

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